Tci state determining method and apparatus, terminal, and network-side device

Abstract

A TCI state determining method and apparatus, a terminal, and a network-side device are provided. The TCI state determining method in the embodiments of this application includes: receiving, by a terminal, a first command; and determining, by the terminal, the number of TCI states applicable for a target resource based on the first command.

What is claimed is: 
     
         1 . A transmission configuration indication (TCI) state determining method, comprising:
 receiving, by a terminal, a first command; and   determining, by the terminal, the number of TCI states applicable for a target resource, based on the first command.   
     
     
         2 . The method according to  claim 1 , wherein in a case that one TCI state is applicable for the target resource, the method further comprises:
 receiving, by the terminal, a second command; and   determining, by the terminal, a TCI state to be applied for transmission of the target resource, based on the second command.   
     
     
         3 . The method according to  claim 2 , wherein the second command indicates one or a plurality of joint TCI states, and the determining, by the terminal, a TCI state to be applied for transmission of the target resource, based on the second command comprises:
 in a case that the second command indicates one joint TCI state, using the one joint TCI state as the TCI state to be applied for transmission of the target resource; or   in a case that the second command indicates a plurality of joint TCI states, using a first target joint TCI state among the plurality of joint TCI states, as the TCI state to be applied for transmission of the target resource.   
     
     
         4 . The method according to  claim 2 , wherein the second command indicates a plurality of downlink TCI states and/or a plurality of uplink TCI states, and the determining, by the terminal, a TCI state to be applied for transmission of the target resource, based on the second command comprises:
 in a case that the target resource is a downlink resource, using a first target downlink TCI state among the plurality of downlink TCI states, as the TCI state to be applied for transmission of the target resource; or   in a case that the target resource is an uplink resource, using a first target uplink TCI state among the plurality of uplink TCI states, as the TCI state to be applied for transmission of the target resource.   
     
     
         5 . The method according to  claim 1 , wherein in a case that a plurality of TCI states are applicable for the target resource, the method further comprises:
 receiving, by the terminal, a third command, wherein the third command is used to schedule transmission of the target resource; and   determining, by the terminal, a TCI state to be applied for transmission of the target resource, based on the third command;   wherein   the third command contains a first indicator field, and the first indicator field is used to indicate, from the plurality of TCI states indicated for the target resource, one of the following:   one TCI state to be applied for transmission of the target resource;   a plurality of TCI states to be applied for transmission of the target resource; and   an order of a plurality of TCI states to be applied for transmission of the target resource.   
     
     
         6 . The method according to  claim 5 , wherein the method further comprises:
 determining that the third command contains the first indicator field, in at least one of the following cases:   upper-layer signaling configures that the third command contains the first indicator field; or   the number of TCI states applicable for the target resource as determined based on the first command is greater than one.   
     
     
         7 . The method according to  claim 5 , wherein the determining a TCI state to be applied for transmission of the target resource, based on the third command comprises:
 in a case that the third command is in a first format, using a first target TCI state, among the TCI states indicated for the target resource, as the TCI state to be applied for transmission of the target resource.   
     
     
         8 . The method according to  claim 1 , wherein a second command indicates a plurality of TCI states, and in a case that a plurality of TCI states are applicable for the target resource, the method further comprises at least one of the following:
 in a case that the target resource is a physical downlink control channel (PDCCH), determining a TCI state to be applied for transmission of the PDCCH from the plurality of TCI states indicated by the second command, based on an identifier of a search space associated with the PDCCH; or   in a case that the target resource is a PDCCH, determining a TCI state to be applied for transmission of the PDCCH from the plurality of TCI states indicated by the second command, based on an identifier of a control resource set associated with a search space associated with the PDCCH.   
     
     
         9 . The method according to  claim 8 , wherein the plurality of TCI states indicated by the second command comprise a first TCI state and a second TCI state, and the search space comprises a first search space and a second search space; wherein
 the determining a TCI state to be applied for transmission of the PDCCH from the plurality of TCI states indicated by the second command comprises:   applying the first TCI state for a PDCCH transmitted through the first search space, and applying the second TCI state for a PDCCH transmitted through the second search space.   
     
     
         10 . The method according to  claim 8 , wherein the plurality of TCI states indicated by the second command comprise a first TCI state and a second TCI state, and the control resource set comprises a first control resource set and a second control resource set; wherein
 the determining a TCI state to be applied for transmission of the PDCCH from the plurality of TCI states indicated by the second command comprises:   applying the first TCI state for a PDCCH transmitted through the first control resource set, and applying the second TCI state for a PDCCH transmitted through the second control resource set.   
     
     
         11 . The method according to  claim 2 , wherein a second command indicates a plurality of TCI states, and in a case that a plurality of TCI states are applicable for the target resource, the method further comprises at least one of the following:
 in a case that the target resource is a PUSCH and a sounding reference signal (SRS) resource set used for transmission of the PUSCH is associated with a channel state information reference signal (CSI-RS), determining a TCI state to be applied for transmission of the CSI-RS from the plurality of TCI states indicated by the second command, based on an identifier of the SRS resource set; or   in a case that the target resource is a PUSCH, determining a TCI state to be applied for transmission of the SRS resource set from the plurality of TCI states indicated by the second command, based on an identifier of an SRS resource set, wherein the SRS resource set is used for transmission of the PUSCH.   
     
     
         12 . The method according to  claim 5 , wherein before the receiving, by the terminal, a third command, the method further comprises:
 determining, by the terminal, a size of the third command based on a second command; wherein the second command is used to determine a TCI state to be applied for transmission of the target resource.   
     
     
         13 . The method according to  claim 12 , wherein the determining, by the terminal, a size of the third command based on a second command comprises:
 determining, by the terminal based on the second command, at least one of the following:   whether a second indicator field is present in the third command;   number of second indicator fields in the third command; or   bit length of the second indicator field in the third command.   
     
     
         14 . The method according to  claim 1 , wherein the method further comprises:
 receiving, by the terminal, a fourth command, wherein the fourth command is used to activate a TCI state to be applied for transmission of the target resource.   
     
     
         15 . The method according to  claim 1 , wherein the method further comprises: receiving, by the terminal, a fifth command, wherein the fifth command is used to indicate at least one of the following:
 a resource pool of the TCI state or a mode of the TCI state, wherein the mode of the TCI state comprises joint indication or separate indication.   
     
     
         16 . A TCI state determining method, comprising:
 sending, by a network-side device, a first command, wherein the first command is used for a terminal to determine the number of TCI states applicable for a target resource.   
     
     
         17 . The method according to  claim 16 , wherein the first command is used for the terminal to determine that one TCI state is applicable for the target resource, and the method further comprises:
 sending, by the network-side device, a second command, wherein the second command is used for the terminal to determine a TCI state to be applied for transmission of the target resource.   
     
     
         18 . The method according to  claim 16 , wherein the first command is used for the terminal to determine that a plurality of TCI states are applicable for the target resource, and the method further comprises:
 sending, by the network-side device, a third command, wherein the third command is used to schedule transmission of the target resource, and the third command is further used for the terminal to determine a TCI state to be applied for transmission of the target resource;   wherein   the third command contains a first indicator field, and the first indicator field is used to indicate, from the plurality of TCI states indicated for the target resource, one of the following:   one TCI state to be applied for transmission of the target resource;   a plurality of TCI states to be applied for transmission of the target resource; and   an order of a plurality of TCI states to be applied for transmission of the target resource.   
     
     
         19 . A terminal, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or instructions are executed by the processor, following steps are implemented:
 receiving, by the terminal, a first command; and   determining, by the terminal, the number of TCI states applicable for a target resource, based on the first command.   
     
     
         20 . A network-side device, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or instructions are executed by the processor, the TCI state determining method according to  claim 16  is implemented.